Tigernmas,[1] son of Follach, son of Ethriel, a descendant of Érimón, was, according to medieval Irish legend and historical traditions, an early High King of Ireland.
According to the Lebor Gabála Érenn he became king when he overthrew his predecessor Conmáel in the Battle of Óenach Macha, and within a year of his accession had won twenty-seven battles against the descendants of Eber Finn, almost completely destroying Eber's line.
Tigernmas was the first king to give drinking-horns to his followers, and the first to have clothes dyed purple, blue and green and decorated with brooches, fringes and ornaments.
After reigning for seventy-seven years (or 100 years according to the Book of Fenagh, P 23), he and three-quarters of the men of Ireland died on Magh Slécht while worshipping Crom Cruach, a cruel deity propitiated with human sacrifice.
[2][3] According to the Annals of the Four Masters, Ireland was without a High King for seven years after his death, before Eochaid Étgudach took the kingship.